babel-plugin-transform-user-env-inline

babel-plugin-transform-user-env-inline

Similar to, and based on babel-plugin-transform-node-env-inline, this plugin inlines user provided environment variables referenced as process.env.ENV_VAR_NAME, and if used as part of a binary expression, optionally & statically evaluates it and then replaces expression with result.

Usage

By default only NODE_ENV is enabled for inlining & evaluation, but any other env vars can be specified via plugin options:

{
    "plugins": [
        [
            "transform-user-env-inline",
            {
                // try to evaluate
                "ASSERTS": true,
                // don't try evaluate
                "API_KEY": false
            }
        ],
    ]
}

Example

Given above config (in .babelrc) and following code:

process.env.NODE_ENV === "development";
process.env.NODE_ENV === "production";
process.env.ASSERTS === "1";
process.env.API_KEY === "foo";

NODE_ENV=development \
ASSERTS=1 \
API_KEY=foo \
babel in.js

Result:

true;
false;
true;
"foo" === "foo"

Authors

Karsten Schmidt, 2020, MIT licensed